@article{GDZPPN001247700, title = {Completely O-simple multiplicative ideals of rings.}, journal = {Semigroup forum}, volume = {2}, year = {1971}, pages = {362-370}, zbl = {0226.16022}, url = {http://dml.mathdoc.fr/item/GDZPPN001247700} }
Lawson, L. Completely O-simple multiplicative ideals of rings.. Semigroup forum, Tome 2 (1971) pp. 362-370. http://gdmltest.u-ga.fr/item/GDZPPN001247700/